Can you think of an alternative means of identifying successful bacterial transformants in this experiment?
What will be an ideal response?
Successful insertion of the gene of interest into the polylinker region will disrupt the lacZ+ gene; such colonies cannot manufacture ?-galactosidase and will therefore remain white in the presence of X-gal. Colonies can thus be screened using X-gal. Of course, the bacteria would have to be grown on media without ampicillin, allowing all the colonies to grow.
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Homologous chromosomes pair with each other during meiosis, but are misaligned. What is the likely outcome if crossing over occurs?
A. One daughter chromosome contains a gene duplication, the other three are normal. B. One daughter chromosome contains a gene deletion, the other three are normal. C. Two daughter chromosomes contain a gene duplication, the other two are normal. D. Two daughter chromosomes contain a gene deletion, the other two are normal. E. One daughter chromosome contains a gene duplication, one contains a gene deletion, and the remaining two are normal.
Salt marsh cordgrass is consumed by herbivorous marsh periwinkle snails, which in turn are consumed by blue crabs
Research has shown that cordgrass productivity is controlled ____.
a. indirectly by the abundance of snails b. indirectly by the abundance of snail predators c. directly by the abundance of snail predators d. directly by the availability of nutrients in the salt marsh e. indirectly by the amount of sunlight penetrating the water
For sexually reproducing organisms, a species
consists of a. individuals sharing a habitat. b. a group of reproductive females. c. populations that have the potential to interbreed and produce fertile offspring. d. individuals that have the same nutritional requirements. e. individuals in the same geographical range with similar ecological requirements.
During which of the following stages of meiosis does the cell contain the greatest amount of DNA?
A. telophase II B. prophase II C. anaphase II D. prophase I